This　paper　systematically　researches　on　the　propagation　characteristics　and　noise　spectrum　of　water　leakage　by　utilization　of　Fourier　transform　methodology,　and　it　puts　forward　a　criteria　of　Minimum　Noise　Level　as　key　parameter　and　noise　spectrum,　the　band　and　noise　intensity　distribution　as　auxiliary　parameters　to　judge　or　early　warn　water　leakage　or　pipe　burst　of　water　distribution　network.　The　effectiveness　of　these　parameters　is　verified　by　the　site　monitoring　datum　of　water　distribution　network　of　Guangzhou　Huadu　Water　Utility.